void main() {
  var name = '博博';
  var age = 18;

  print(name);
  print(age);

  print('$name今年刚满$age岁');

  age += 1;

  print('$name今年已经$age岁了');
  print('${name + '博'} 今年已经 ${age + 1} 岁了');
}
